后端开发|php教程
CodeIgniter,redis,方法
后端开发-php教程1. 在autoload.php 中加入 如下配置行
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$autoload[libraries] = array( edis);
2. 在/application/config 中加入文件 redis.php
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文件内容如下：
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3. 在 /application/libraries 中加入文件 Redis.php
文件来源：redis库文件包
文件内容：
_ci = get_instance(); $this->_ci->load->config( edis); // Check for the different styles of configs if (isset($params[connection_group])) {// Specific connection group$config = $this->_ci->config->item( edis_ . $params[connection_group]); } elseif (is_array($this->_ci->config->item( edis_default))) {// Default connection group$config = $this->_ci->config->item( edis_default); } else {// Original config style$config = array( host => $this->_ci->config->item( edis_host), port => $this->_ci->config->item( edis_port), password => $this->_ci->config->item( edis_password),); } // Connect to Redis $this->_connection = @fsockopen($config[host], $config[port], $errno, $errstr, 3); // Display an error message if connection failed if ( ! $this->_connection) {show_error(Could not connect to Redis at . $config[host] . : . $config[port]); } // Authenticate when needed $this->_auth($config[password]); } /** * Call * * Catches all undefined methods * @param string method that was called * @param mixed arguments that were passed * @return mixed */ public function __call($method, $arguments) { $request = $this->_encode_request($method, $arguments); return $this->_write_request($request); } /** * Command * * Generic command function, just like redis-cli * @param string full command as a string * @return mixed */ public function command($string) { $slices = explode( , $string); $request = $this->_encode_request($slices[0], array_slice($slices, 1)); return $this->_write_request($request); } /** * Auth * * Runs the AUTH command when password is set * @param string password for the Redis server * @return void */ private function _auth($password = NULL) { // Authenticate when password is set if ( ! empty($password)) {// See if we authenticated successfullyif ($this->command(AUTH . $password) !== OK){ show_error(Could not connect to Redis, invalid password);} } } /** * Clear Socket * * Empty the socket buffer of theconnection so data does not bleed over * to the next message. * @return NULL */ public function _clear_socket() { // Read one character at a time fflush($this->_connection); return NULL; } /** * Write request * * Write the formatted request to the socket * @param string request to be written * @return mixed */ private function _write_request($request) { if ($this->debug === TRUE) {log_message(debug, Redis unified request: . $request); } // How long is the data we are sending? $value_length = strlen($request); // If there isn any data, just return if ($value_length <= 0) return NULL; // Handle reply if data is less than or equal to 8192 bytes, just send it over if ($value_length _connection, $request); } else {while ($value_length > 0){ // If we have more than 8192, only take what we can handle if ($value_length > 8192) {$send_size = 8192; } // Send our chunk fwrite($this->_connection, $request, $send_size); // How much is left to send? $value_length = $value_length - $send_size; // Remove data sent from outgoing data $request = substr($request, $send_size, $value_length);} } // Read our request into a variable $return = $this->_read_request(); // Clear the socket so no data remains in the buffer $this->_clear_socket(); return $return; } /** * Read request * * Route each response to the appropriate interpreter * @return mixed */ private function _read_request() { $type = fgetc($this->_connection); // Times we will attempt to trash bad data in search of a // valid type indicator $response_types = array(+, -, :, $, *); $type_error_limit = 50; $try = 0; while ( ! in_array($type, $response_types) && $try _connection);$try++; } if ($this->debug === TRUE) {log_message(debug, Redis response type: . $type); } switch ($type) {case +: return $this->_single_line_reply(); break;case -: return $this->_error_reply(); break;case :: return $this->_integer_reply(); break;case $: return $this->_bulk_reply(); break;case *: return $this->_multi_bulk_reply(); break;default: return FALSE; } } /** * Single line reply * * Reads the reply before the EOF * @return mixed */ private function _single_line_reply() { $value = rtrim(fgets($this->_connection)); $this->_clear_socket(); return $value; } /** * Error reply * * Write error to log and return false * @return bool */ private function _error_reply() { // Extract the error message $error = substr(rtrim(fgets($this->_connection)), 4); log_message(error, Redis server returned an error: . $error); $this->_clear_socket(); return FALSE; } /** * Integer reply * * Returns an integer reply * @return int */ private function _integer_reply() { return (int) rtrim(fgets($this->_connection)); } /** * Bulk reply * * Reads to amount of bits to be read and returns value within * the pointer and the ending delimiter * @return string */ private function _bulk_reply() { // How long is the data we are reading? Support waiting for data to // fully return from redis and enter into socket. $value_length = (int) fgets($this->_connection); if ($value_length <= 0) return NULL; $response = \; // Handle reply if data is less than or equal to 8192 bytes, just read it if ($value_length _connection, $value_length); } else {$data_left = $value_length; // If the data left is greater than 0, keep reading while ($data_left > 0 ) { // If we have more than 8192, only take what we can handle if ($data_left > 8192) {$read_size = 8192; } else {$read_size = $data_left; } // Read our chunk $chunk = fread($this->_connection, $read_size); // Support reading very long responses that don come through // in one fread $chunk_length = strlen($chunk); while ($chunk_length _connection, $keep_reading);$chunk_length = strlen($chunk); } $response .= $chunk; // Re-calculate how much data is left to read $data_left = $data_left - $read_size;} } // Clear the socket in case anything remains in there $this->_clear_socket(); return isset($response) ? $response : FALSE; } /** * Multi bulk reply * * Reads n bulk replies and return them as an array * @return array */ private function _multi_bulk_reply() { // Get the amount of values in the response $response = array(); $total_values = (int) fgets($this->_connection); // Loop all values and add them to the response array for ($i = 0; $i _connection, 2);// If this is a second or later pass, we also need to get rid// of the $ indicating a new bulk reply and its length.if ($i > 0){ fgets($this->_connection); fgets($this->_connection, 2);}$response[] = $this->_bulk_reply(); } // Clear the socket $this->_clear_socket(); return isset($response) ? $response : FALSE; } /** * Encode request * * Encode plain-text request to Redis protocol format * @link http://redis.io/topics/protocol * @param string request in plain-text * @param string additional data (string or array, depending on the request) * @return string encoded according to Redis protocol */ private function _encode_request($method, $arguments = array()) { $request = $ . strlen($method) . self::CRLF . $method . self::CRLF; $_args = 1; // Append all the arguments in the request string foreach ($arguments as $argument) {if (is_array($argument)){ foreach ($argument as $key => $value) {// Prepend the key if we e dealing with a hashif (!is_int($key)){ $request .= $ . strlen($key) . self::CRLF . $key . self::CRLF; $_args++;}$request .= $ . strlen($value) . self::CRLF . $value . self::CRLF;$_args++; }}else{ $request .= $ . strlen($argument) . self::CRLF . $argument . self::CRLF; $_args++;} } $request = * . $_args . self::CRLF . $request; return $request; } /** * Info * * Overrides the default Redis response, so we can return a nice array * of the server info instead of a nasty string. * @return array */ public function info($section = FALSE) { if ($section !== FALSE) {$response = $this->command(INFO . $section); } else {$response = $this->command(INFO); } $data = array(); $lines = explode(self::CRLF, $response); // Extract the key and value foreach ($lines as $line) {$parts = explode(:, $line);if (isset($parts[1])) $data[$parts[0]] = $parts[1]; } return $data; } /** * Debug * * Set debug mode * @param bool set the debug mode on or off * @return void */ public function debug($bool) { $this->debug = (bool) $bool; } /** * Destructor * * Kill the connection * @return void */ function __destruct() { if ($this->_connection) fclose($this->_connection); }}?>
4. 然后你就可以 在文件中这样使用了
redis->get(mark_.$gid) === null){ //如果未设置 $this->redis->set(mark_.$gid, $giftnum); //设置 $this->redis->EXPIRE(mark_.$gid, 30*60); //设置过期时间 （30 min） }else{ $giftnum = $this->redis->get(mark_.$gid); //从缓存中直接读取对应的值 }?>
5. 重点是你所需要的 东东在这里很详细的讲解了
所有要用的函数只需要更改
$redis ==> $this->redis
需要注意的是：
（1）你的本地需要安装 redis服务(windows安装)
（2）并开启redis 服务
（3）不管是windows 还是linux 都需要装 php对应版本的 redis扩展
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